This is likely an issue only for issues where we need the password from HDFS in order to access HDFS. This should definitely be avoided by not having a static credential provider path configured for startup that includes such a dependency.
For instance, the JIRA you cite is an example where we need to do group lookup in order to determine whether you are allowed to access the HDFS resource that provides the password required to do group lookup. Storing passwords in credential stores within HDFS should be perfectly safe for things like SSL that don't have a dependency on HDFS itself. Those details are in the documentation page that you referenced but if they need to be made more clear that completely makes sense. On Wed, Apr 24, 2019 at 9:56 PM Karthik P <karthikshva...@gmail.com> wrote: > Team, > > Datanode is failed to restart after configuring credentials provider, > storing credential into HDFS (jceks://hdfs@hostname > :9001/credential/keys.jceks). > > Getting a StackOverFlow error in datanode jsvc.out file similar to > HADOOP-11934 <https://issues.apache.org/jira/browse/HADOOP-11934>. > > As per the documentation link > < > https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/CredentialProviderAPI.html#Supported_Features > >, > we support storing credential in HDFS. > > *URI jceks://file|hdfs/path-to-keystore, is used to retrieve credentials > from a Java keystore. The underlying use of the Hadoop filesystem > abstraction allows credentials to be stored on the local filesystem or > within HDFS.* > > Assume a scenario, where all of our data nodes were down and we configured > hadoop.security.credential.provider.path to HDFS location. So when we try > to get FileSystem.get() during datanode restart we end up doing recursive > call if HDFS is inaccessible. > > > /** > * Check and set 'configuration' if necessary. > * > * @param theObject object for which to set configuration > * @param conf Configuration > */ > public static void setConf(Object theObject, Configuration conf) { > if (conf != null) { > if (theObject instanceof Configurable) { > ((Configurable) theObject).setConf(conf); > } > setJobConf(theObject, conf); > } > } > > > No issues if we store credential in LFS (localjceks://file). The problem > only with jceks://hdfs/. > > Can I change Hadoop doc that we would not support storing credential in > HDFS? Or Shall I handle this scenario only for statup issue? > > > Thanks, > Karthik >
